Frontier Airlines Starts Charging for Carry-On Bags

Carrier Slashes Prices on Its Most Basic Airfares

Frontier Airlines Inc. adopted fees for carry-on bags and slashed prices on its most basic airfares, stepping up its transformation into one of the ultralow-cost carriers that is helping drive increased use of airline fees in the U.S.

Frontier, which operates a fleet of 53 aircraft flying mainly from its base in Denver, said Monday that it is fully "unbundling" its most basic fares. It will now charge extra for carry-on bags and services such as seat assignments that have typically been included in the ticket...